Measuring and testing – Vibration – By mechanical waves
Reexamination Certificate
2006-11-09
2009-11-17
Williams, Hezron (Department: 2856)
Measuring and testing
Vibration
By mechanical waves
C702S159000
Reexamination Certificate
active
07617731
ABSTRACT:
An ultrasonic measuring method includes the steps of: receiving ultrasonic waves, which have been transmitted by a spread spectrum technique using mutually different codes, at first and second receivers, thereby generating first and second received signals, respectively; generating interference signals, of which the amplitudes are equal to or greater than respective threshold values, from the first and second received signals that have been despread with a code that has been used to spread any of the ultrasonic waves other than a desired one; removing the spread interference signals from the first and second received signals; calculating maximum correlation values between the first and second despread received signals for the respective threshold values; selecting one of the threshold values, at which the greatest one of the maximum correlation values has been obtained, as a threshold value for canceling interference; and calculating the propagation distance or propagation azimuth of the desired ultrasonic wave by the amount of time it has taken for the first and second received signals to arrive.
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International Search Report for corresponding Application No. PCT/JP2006/322377 mailed Dec. 19, 2006.
Hashimoto Masahiko
Suginouchi Takehiko
Wang Yong
Miller Rose M
Panasonic Corporation
Renner , Otto, Boisselle & Sklar, LLP
Williams Hezron
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